If you want to produce high-efficiency solar cells, use float zone wafers instead of regular wafers generated using the CZ method. A float zone wafer has very low oxygen levels, a high growth rate, and precise dopant control, which helps minimize the defects present in a wafer. When a wafer is free from contaminants and defects, it is able to perform more efficiently and effectively. Here you can learn more about the use of float zone wafer in the production of high-efficiency solar silicon cells.
The most common method used to grow single silicon crystals is the Czochralski method. But the development of the float zone method led to revolutionary discoveries that made an impact in the semiconductor industry.The float zone method produces wafers that are more efficient and powerful, allowing them to perform better when utilized in solar applications. Unfortunately, this method is too expensive for mass production. A float zone wafer is only utilized for laboratory works and experiments only.
Float zone method begins with melting silicon with a p-type dopant in a large crucible container. It is then slowly drawn out of the container to chill. After this, the ingot produced is then sliced using a saw to form circular wafers. Square cell profiles are able to better utilize the space when enclosing cells into a module.Loss is minimized when wafers are cut into squares instead of circles. Using the ribbon casting technique when cutting silicon also helps reduce the loss of silicon and allows for thinner wafers.
Two processes are used for multi-crystalline silicon: Bridgman technique and the block-casting technique. Multi-crystalline silicon is easily generated by pouring molten silicon into a molded structure of any shape you want and then allowing it to set. As the silicon cools, it starts to solidify and columnar crystal forms. This process preserves more silicon, which helps lessen the loss.
A float zone wafer can be used for various applications, including solar cells. At Wafer World, we offer well-crafted float zone wafers. To learn more, contact us to request a quote.